Hey,

We just published a pytest plugin to automate running a test suite in parallel since this isn't possible with pytest-xdist.

https://pypi.org/project/pytest-freethreaded/

The pattern is loosely based on guidance in this repo.

We also discovered when running a couple of test suites some pretty nasty bugs, including a segfault in Pillow tonybaloney/pytest-freethreaded#11

Think it could be worth mentioning the plugin on the site (happy to submit a PR).

It's not designed to be run in CI since

1. It would be really slow
2. Concurrency bugs are not necessarily the fault of no-gil

Instead, I expect maintainers to run this a few times to help find any really nasty bugs.